Last January my family of 4 spent a 7 nights in a value studio. We had exactly 69 points left and we squeezed the trip in since we had APs. We were just fine. We never pulled out the sofa bed. My daughter slept on the couch (She thought it was very comfortable), and son slept on a twin air mattress right in front of the couch. The main difference with the value studio is you are missing the storage cabinet. We kept the suitcases under the bed and I put several outfits into the dresser. After a few days I rotated clothes. I think you would be just fine. If your daughter is ok sleeping on the couch without pulling it out you will save a lot of room.
I was lucky, and got a value studio for February just before the 7 month mark! Two days weren't available, but my waitlist came through. Happy Birthday to me!! Thanks to value studios I'm able to squeeze this trip in. I LOVE them!!